radvd - router advertisement daemon for IPv6
radvd [ -vh ] [ -d debuglevel ] [ -C configfile ] [ -p pidfile ] [ -m method ] [ -l log-
file ] [ -f facility ] [ -t chrootdir ] [ -u username ]
radvd is the router advertisement daemon for IPv6. It listens to router solicitations and
sends router advertisements as described in "Neighbor Discovery for IP Version 6 (IPv6)"
(RFC 2461). With these advertisements hosts can automatically configure their addresses
and some other parameters. They also can choose a default router based on these advertise-
Note that if debugging is not enabled, radvd will not start if IPv6 forwarding is dis-
abled. IPv6 forwarding can be controlled via sysctl(8), net.ipv6.conf.all.forwarding on
Linux or net.inet6.ip6.forwarding on BSD.
Similarly, the configuration file must not be writable by others, and if non-root opera-
tion is requested, not even by self/own group.
For every one character option there is also a long option, which is listed right next to
the "short" option name:
Displays the version of radvd and then aborts.
Displays a short usage description and then aborts.
-d debuglevel, --debug debuglevel
With this option you turn on debugging information. The debugging level is an inte-
ger in the range from 1 to 4, from quiet to very verbose. A debugging level of 0
completely turns off debugging. If a debugging level greater than 0 is used, radvd
doesn't background itself on start. The default debugging level is 0.
-C configfile, --config configfile
Specifies an alternate config file. Normally the compiled in default
/etc/radvd.conf is used.
-p pidfile, --pidfile pidfile
Specifies an alternate pidfile. Normally the compiled in default
/var/run/radvd/radvd.pid is used.
-m method, --method method
Specifies the logging method to use. Possibly values are:
none Completely disables any logging.
Logs to the logfile which is specified by the -l option. If no logfile is
specified on the command line, then a compiled in default is used (see next
stderr Logs to standard error.
syslog Logs to syslog (default method).
-l logfile, --logfile logfile
Specifies the logfile to use when using the logging method logfile. The default
logfile is /var/log/radvd.log.
-f facility, --facility facility
Specifies the facility (as an integer) when using syslog logging. Default is
-t chrootdir, --chrootdir chrootdir
If specified, switches to chrootdir before doing anything else. This directory and
its subdirectories must have been populated first. For security reasons, -u must
always be used when using chrootdir.
Note that this option will not currently work under Linux because radvd requires
access to the /proc filesystem.
-u username, --username username
If specified, drops root privileges and changes user ID to username and group ID to
the primary group of username. This is recommended for security reasons. You
might also need to use -p to point to a file in a username -writable directory
There certainly are some bugs. If you find them or have other suggestions please contact
Nathan Lutchansky <firstname.lastname@example.org> or Pekka Savola <email@example.com>.
Pedro Roque <firstname.lastname@example.org> - wrote first version for Linux
Lars Fenneberg <email@example.com> - previous maintainer
Pekka Savola <firstname.lastname@example.org> - current maintainer
Nathan Lutchansky <email@example.com> - current maintainer
Craig Metz <firstname.lastname@example.org> - port to NRL's IPv6 code for BSD4.4
Marko Myllynen <email@example.com> - RFC 2461 update, Mobile IPv6 support
radvd 0.7.2 29 Mar 2001 RADVD(8)